Change permissions URL in main readme

doc/README.md

@@ -11,7 +11,7 @@
 - [Importing and exporting projects between instances](user/project/settings/import_export.md).
 - [Markdown](markdown/markdown.md) GitLab's advanced formatting system.
 - [Migrating from SVN](workflow/importing/migrating_from_svn.md) Convert a SVN repository to Git and GitLab.
-- [Permissions](permissions/permissions.md) Learn what each role in a project (external/guest/reporter/developer/master/owner) can do.
+- [Permissions](user/permissions.md) Learn what each role in a project (external/guest/reporter/developer/master/owner) can do.
 - [Profile Settings](profile/README.md)
 - [Project Services](project_services/project_services.md) Integrate a project with external services, such as CI and chat.
 - [Public access](public_access/public_access.md) Learn how you can allow public and internal access to projects.